Question

Quero a resposta de:
a) 5x-4y=7
x+3y=9

b) x+4y=7
3x-2y=7

Answer 1

a) X= 9-3Y
5*(9-3Y)-4Y=7
45-15Y-4Y=7
-19Y=-38
Y=2

Y=2
X=3


b) X= 7-4Y
3*(7-4Y)-2Y=7
21-12Y-2Y=7
21-14Y=7
-14Y=-14
Y=1

Y=1
X=3